The ones going across the axle are cheap. The one going from front to the rear is easier to make yourself. It is also only a few bucks for the line. If you're gonna have a shop fix it I'd guess $50 to $75.

If you are going to keep it for a while I would replace with stainless steel. They are more expensive, but you will not have the rust/rot problems. I put them on my 96 f-250 from Classic Tube if I remember right.